Question

Which of the following processes is endothermic? Group of answer choices water droplets condensing on a soda can on a hot summer day an ice pack getting cold (due to ammonium nitrate dissolving in water inside the pack) thermite reaction between iron(III) oxide and aluminum (spectacular flames are observed) freezing water to make ice cubes none of the above are endothermic processes

Answer 1

Answer: an ice pack getting cold (due to ammonium nitrate dissolving in water inside the pack)

Explanation:

Endothermic reactions: These are the reactions in which energy is required in the reaction. The energy of the products are more than the energy of the reactants.

Exothermic reactions: These are the reactions in which energy is released in the reaction. The energy of the products is less than the energy of the reactants.

a) water droplets condensing on a soda can on a hot summer day : As the gaseous molecules are changing into liquid phase, energy is released and is exothermic

b) an ice pack getting cold (due to ammonium nitrate dissolving in water inside the pack) : As the temperature is decreasing , energy is absorbed by the surroundings and thus is endothermic

c) thermite reaction between iron(III) oxide and aluminium (spectacular flames are observed)  : As flames are produced, the energy is released and thus is exothermic

d) freezing water to make ice cubes  : As the liquid molecules are changing into solid phase, energy is released and is exothermic